Chromatography

Water SolubilityAdd approximately 6 drops of water to the test tube containing your unknown. Shake the tube and/or stir with a glass stirring rod. A soluble unknown will form a homogeneous solution with water, while an insoluble liquid will remain as a separate phase. A liquid which is soluble in water may be either a low molecular weight polar compound of up to 5 carbon atoms or less. You may add additional water, up to 1 mL, if your compound does not completely dissolve with the smaller amount. Check the pH of the water to determine if your unknown is partially or completely soluble in water and whether your compound has changed the pH of the water. pH paper tus red: water soluble acidic compound pH paper tus blue: water soluble basic compound pH paper does not change color: water soluble neutral .]2) 5% NaOH SolubilityAdd approximately 1 mL of 5% NaOH in small portions of about 6 drops each to the test tube containing your unknown. Shake test tube vigorously after the addition of each portion of solvent. Solubility will be indicated by the formation of a homogeneous solution, a color change, or the evolution of gas or heat. If soluble, then your unknown Chromatography...

sodium test The sodium fusion test is used in elemental analysis for the qualitative determination of the presence of halogens, nitrogen and sulphur in an organic compound. It was developed by J. L. Lassaigne.[1] The test involves heating the sample strongly with clean sodium metal, "fusing" it with the sample. A variety of techniques has been described. The "fused" sample is plunged into water, and the usual qualitative tests are performed on the resultant solution for the respective possible constituents.[1] The halogens, nitrogen and sulphur are covalently bonded to the organic compounds. In order to detect them, the elements need to be converted into their ionic forms. This is done by fusing the organic compound with sodium metal. The ionic compounds formed during the fusion are extracted in aqueous solution and can be detected by simple chemical tests. The extract is called sodium fusion extract or Lassaigne's extract. When an organic compound is heated strongly with sodium, any halogens, nitrogen, and sulphur will be converted into inorganic sodium salts such as sodium halide (for halides), sodium cyanide (for nitrogen), sodium sulfide (for sulphur), and sodium thiocyanat Chromatography...

3and 5. di nitro benzoic acid derivative of the common alcohols, ethers and is phenyl polyurethane. Alpha-naphthyl polyurethane may also be used, but this test is used for more phenols Preparation of 3 and 5 Diy nitro benzoate: A combination of 3 and 5 January Nytrvbnzvyyl chloride with alcohol, the corresponding ester is obtained and the methods for primary alcohols, secondary and tertiary appropriate. Especially for Alklhayy that is dissolved in water and minor amounts of water may be useful. p. 368–375; https://en.wikipedia.org/wiki/3,5-Dinitrobenzoic_acid Test method: liquid alcohols: 2ml of alcohol in a dry test tube with about half a gram of 3 and 5 December nitro-benzoyl chloride mixture and gently boil it for 5 minutes. Add about 10 ml of distilled water and the solution is cooled in an ice bath until a solid product is obtained. The raw product collected and washed with 10 mL of 2% sodium carbonate and water solution - crystallized photos Atanvlmjdda. ) solid alcohols: 1g of solid alcohol in 5 ml of dry pyridine solution and half a gram of 3 and 5 December nitro benzoyl chloride to add it. Heat the mixture to reflux for 15 minutes Weights. The re Chromatography...